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Stock-Based Compensation Plans
 9 Months Ended
Sep. 30, 2021
Share-based Payment Arrangement [Abstract]  
Stock-Based Compensation Plans Stock-Based Compensation Plans
Employee Stock Purchase Plan
Shares issued under the 2017 Employee Stock Purchase Plan during the nine months ended September 30, 2021 and 2020, totaled 86,877 and 114,709, respectively.

Stock Options
A summary of stock option activity is as follows:
Number of
Shares		Weighted Average
Exercise Price ($)		Weighted Average
Remaining Contractual
Term (Years)		Aggregate Intrinsic Value
of In-the-Money
Options ($)
Outstanding as of December 31, 20202,186,511 $17.87 
Exercised(380,676)19.05 
Outstanding as of September 30, 20211,805,835 $17.63 3.27$23,662,370 
Exercisable as of September 30, 20211,805,835 $17.63 3.27$23,662,370 

The total intrinsic value of stock options exercised during the nine months ended September 30, 2021 and 2020, was $7.8 million and $14.3 million, respectively. There were no stock options granted during the nine months ended September 30, 2021 or 2020.
Long-term Incentive Program Performance Share Awards
During the nine months ended September 30, 2021, the Company modified the performance target for the remaining outstanding long-term incentive program performance shares ("LTIP performance shares") in consideration of the impact of the COVID-19 pandemic, resulting in additional stock-based compensation expense of approximately $0.4 million. During the nine months ended September 30, 2021, a total of 10,457 LTIP performance shares vested. The Company withheld 4,527 of those shares to pay the employees’ portion of the minimum payroll withholding taxes.

Total Shareholder Return Awards
A summary of nonvested total shareholder return awards ("TSRs") is as follows:
Number of
Shares		Weighted Average
Grant Date Fair Value
Nonvested as of December 31, 20201,367,728 $34.59 
Granted367,317 50.60 
Vested(782,588)31.31 
Forfeited(153,681)38.57 
Change in payout rate391,294 31.31 
Nonvested as of September 30, 20211,190,070 $40.10 

During the nine months ended September 30, 2021, a total of 782,588 TSRs awards granted in fiscal 2018 vested and achieved a payout rate of 200% based on the Company's total shareholder return as compared to a group of peer companies over a three-year performance period. The Company withheld 205,373 of those shares to pay the employees’ portion of the minimum payroll withholding taxes.

The fair value of TSRs granted during the nine months ended September 30, 2021 and 2020, were estimated on the date of grant using the Monte Carlo simulation model, acceptable under ASC 718, Compensation - Stock Compensation, using the following weighted average assumptions:

Nine Months Ended September 30,
20212020
Expected life (years)2.82.8
Risk-free interest rate0.3 %0.5 %
Expected volatility41.2 %31.4 %
Expected dividend yield— — 

Restricted Share Units
A summary of nonvested restricted share unit awards ("RSUs") is as follows:
Number of
Shares		Weighted Average
Grant Date Fair Value
Nonvested as of December 31, 20201,118,182 $27.34 
Granted578,220 39.27 
Vested(522,608)27.69 
Forfeited(232,734)30.54 
Nonvested as of September 30, 2021941,060 $33.69 

During the nine months ended September 30, 2021, a total of 522,608 RSUs vested. The Company withheld 155,031 of those shares to pay the employees’ portion of the minimum payroll withholding taxes.
As of September 30, 2021, there were unrecognized compensation costs of $23.5 million and $21.3 million related to nonvested RSUs and TSRs, respectively, which the Company expects to recognize over weighted average periods of 1.9 years and 2.0 years, respectively.The Company recorded stock-based compensation expense recognized under ASC 718 for the three months ended September 30, 2021 and 2020, of $6.4 million and $8.1 million, respectively, with corresponding tax benefits of $0.9 million and $1.4 million, respectively. The Company recorded stock-based compensation expense recognized under ASC 718 for the nine months ended September 30, 2021 and 2020, of $20.8 million and $22.9 million, respectively, with corresponding tax benefits of $3.1 million and $4.2 million, respectively.